https://www.hiddenhousing.org/map/state/county/sold/sold_median_days_on_market/DC
https://www.hiddenhousing.org/rankings/state/county/sold/sold_median_days_on_market/DC
https://www.hiddenhousing.org/map/state/county/sold/sold_median_days_on_market/DC/436/District-of-Columbia